Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1981-08-27
1983-09-27
Ruehl, Charles A.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
G01N 3700
Patent
active
044061536
ABSTRACT:
An ultrasound beam charcterization device is provided which may be employed during manufacture of diagnostic ultrasound equipment or during use thereof in the field in order to determine the beam profile of the ultrasonic transducer. The device includes a substantially air tight enclosure or box, having therein a thin element characterized by the properties of substantially uniform acoustic scattering and a different back scatter coefficient than the surrounding filler medium. The element is preferably oriented along or parallel to the axis of radiation of the transducer, and is advantageously in the form of a synthetic resin cellular foam material having a relatively high scattering level, which may be embedded in a different foam of lower scattering level. A reticulated cellular foam and salt solution fill the remaining volume of the preferred device, thereby permitting the imaging of transducer beam profiles in a tissue equivalent material.
REFERENCES:
patent: 4331021 (1982-05-01), Lopez et al.
Edmonds et al.--"A Human Tissue Phantom"--Conference, Gaithersburg, Md., U.S.A. (Jun. 1977).
Sommer et al.--"A Phantom for Imaging Biological Fluids by Ultrasound & CT Scanning"--Ultrasound in Med. & Biol., vol. 6, No. 2, pp. 135-140, 1980.
American Institute of Ultrasound in Medicine Standard 100 Millimeter Test Object Including Standard Procedure for Its Use, Adopted as a Standard at the 1974 AIUM Meeting, Seattle, Washington. _
First Experiences with a Solid Tissure Model for the Standardization of A- and B-Scan Instruments in Tissue Diagnois, P. Till and K. C. Ossoinig, Ultrasound in Medicine, vol. 3B, White & Brown, Eds. Plenum Publishing Co., NY, NY 10011, 1975.
Standard Phantom Object for Measurements of Gray Scale and Dynamic Range of Ultrasonic Equipment, Anant K. Nigam, C.B.S. Laboratories, Stamford, Conn., Acoustical Holography, vol. 6, N. Booth, Ed., 1975, Plenum Publishing Co., NY, NY 10111.
Jaeger Paul M.
Maklad Nabil F.
Ophir Jonathan
Acoustic Standards Corporation
Ruehl Charles A.
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